Lithium Battery Electrolyte Additive for High-Temperature SEI Protection
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Solution Overview
Problem
Lithium secondary batteries face degradation due to surface damage and side reactions, leading to reduced lifespan and environmental pollution from waste plastics, which emit greenhouse gases upon disposal.
Innovation Solution
An electrolyte solution for lithium secondary batteries comprising an additive with a specific chemical structure, an organic solvent, and a lithium salt, which forms a robust solid electrolyte interphase (SEI) to enhance high-temperature stability and prevent gas generation and battery thickness increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used in lithium secondary batteries, then the batteries can operate with standard performance, but the batteries suffer from surface damage and side reactions that reduce lifespan and cause degradation under high-temperature conditions
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound as an intermediary substance in the electrolyte solution that mediates between the electrode and the conventional electrolyte components. This compound forms a protective interface layer that prevents direct harmful interactions between the nickel-based cathode and the electrolyte, thereby reducing surface damage and side reactions while extending battery lifespan
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte solution by incorporating fluorinated cyclic carbonate compounds at specific concentrations (0.1-5 wt%). This parameter change alters the electrochemical properties of the electrolyte, enabling it to form more stable solid electrolyte interphase (SEI) layers and protect against high-temperature degradation without compromising battery performance
2Duration of action of stationary object
If secondary batteries are disposed of after their lifespan, then waste plastics are generated that are difficult to recycle and cause environmental pollution, but extending the battery lifespan requires improved electrolyte composition to resist degradation
Solution Approach 1:
The patent applies preliminary protective action by incorporating fluorinated cyclic carbonate compounds into the electrolyte solution before the battery undergoes degradation. These compounds proactively form stable protective films on electrode surfaces during initial cycles, preventing surface damage and side reactions that would otherwise accumulate over time and lead to premature battery failure, thereby extending lifespan and reducing waste
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves capacity retention and resistance stability under high-temperature conditions, extending battery lifespan and reducing environmental pollution by minimizing waste and greenhouse gas emissions.
Implementation Method 1
which forms a robust solid electrolyte interphase (SEI) to enhance high-temperature stability
Data Source
AI summary
Provided is an electrolyte solution for a lithium secondary battery and a lithium secondary battery including the electrolyte solution. The electrolyte solution includes an additive represented by a specific chemical formula, an organic solvent and a lithium salt. The lithium secondary battery including the electrolyte solution provide enhanced high-temperature properties.